Abstract

We have experimentally implemented the distribution of photon pairs produced by spontaneous parametric downconversion through telecom dense-wavelength-division-multiplexing filters. Using the measured counts and coincidences between symmetric channels, we evaluate the maximum fringe visibility that can be obtained with polarization-entangled photons and compare different filter technologies.

Number of true coincidences per second as a function of inband-pair-emission probability for the diffraction grating filter, comparing Gaussian and flat-top shapes for the channel pairs 23–25, 22–26, and 21–27.